In this paper, the Vapor Cloud Explosion Damage
Assessment (VExDAM) module in BREEZE ExDAM
is used to demonstrate a high speed 3D modeling
technique that can quickly:
1. Generate 3D models of large-scale chemical/
petroleum facilities with hundreds of building
structures, hundreds of release locations, and
hundreds of congestion zones
2. Simulate, display, and document the consequences
of individual release scenarios involving a subset
of congestion zones within a single plume geometry
3. Compute, display, and document the maximum
consequence levels resulting from explosions at all
identified congestion zones
In this paper, the Vapor Cloud Explosion Damage Assessment module in BREEZE ExDAM is used to demonstrate a high speed 3D modeling technique that can quickly generate 3D models of large-scale chemical/petroleum facilities, simulate the consequences of individual release scenarios, and compute the maximum consequence levels resulting from explosions at all identified congestion zones.
Explosion and Damage Assessment Computer Simulation using HEXDAMBREEZE Software
"This article presents the results of simulation software
(BREEZE® HEXDAM) that models the effects of blast
waves from a hypothetical terrorist bombing. "
Mr. Chiew Teck Wee, director of Riverstone Environmental Sdn Bhd and strategic business partner of Trinity Consultants, presented at the 2nd ICEOH Conference in Malaysia on the use of BREEZE Risk Analyst for environmental health impact assessments.
In this presentation, Mr. Chiew Teck Wee discusses the many uses and features of Risk Analyst, a human health and ecological risk assessment modeling suite. Risk Analyst has been developed to perform multi-media fate, transport and exposure modeling and is also used for estimating potential adverse impacts to human health and ecological receptors. Topics discussed also include how Risk Analyst fully implements the HHRAP, a U.S. EPA guidance document for performing site-specific, multi-media and multi-pathway human health risk assessments (HHRA) and examples of case studies where the tool has been used to evaluate cancer risk.
A Comparison Study in Response to the Proposed Replacement of CALINE3 with AE...BREEZE Software
This paper compares AERMOD with CALINE3-based models and RLINE 9 (a research model specifically for roadway sources developed by U. S. EPA’s Office of Research and Development) using a field study conducted in downtown Los Angeles in 2008. The evaluation supports the proposed replacement when AERMOD is executed with onsite meteorological data.
AERMOD and AUSPLUME: Understanding the Similarities and Differences BREEZE Software
In this presentation, similarities and differences between AERMOD and AUSLPUME are discussed and analysed with the ultimate goal of easing the transition from AUSPLUME to AERMOD in Victoria, as well as Australia as a whole. Topics discussed include source types, treatment of terrain, plume rise algorithms, low wind speed conditions, and chemical transformations.
Technical Considerations of Adopting AERMOD into Australia and New Zealand BREEZE Software
To ease the adoption of AERMOD into Australia and New Zealand, several technical aspects that are important to the use of AERMOD are discussed in this presentation. These technical aspects include mixing height calculation techniques, surface parameter sensitivities and considerations, urban option applicability, and selection of terrain.
In this paper, the Vapor Cloud Explosion Damage Assessment module in BREEZE ExDAM is used to demonstrate a high speed 3D modeling technique that can quickly generate 3D models of large-scale chemical/petroleum facilities, simulate the consequences of individual release scenarios, and compute the maximum consequence levels resulting from explosions at all identified congestion zones.
Explosion and Damage Assessment Computer Simulation using HEXDAMBREEZE Software
"This article presents the results of simulation software
(BREEZE® HEXDAM) that models the effects of blast
waves from a hypothetical terrorist bombing. "
Mr. Chiew Teck Wee, director of Riverstone Environmental Sdn Bhd and strategic business partner of Trinity Consultants, presented at the 2nd ICEOH Conference in Malaysia on the use of BREEZE Risk Analyst for environmental health impact assessments.
In this presentation, Mr. Chiew Teck Wee discusses the many uses and features of Risk Analyst, a human health and ecological risk assessment modeling suite. Risk Analyst has been developed to perform multi-media fate, transport and exposure modeling and is also used for estimating potential adverse impacts to human health and ecological receptors. Topics discussed also include how Risk Analyst fully implements the HHRAP, a U.S. EPA guidance document for performing site-specific, multi-media and multi-pathway human health risk assessments (HHRA) and examples of case studies where the tool has been used to evaluate cancer risk.
A Comparison Study in Response to the Proposed Replacement of CALINE3 with AE...BREEZE Software
This paper compares AERMOD with CALINE3-based models and RLINE 9 (a research model specifically for roadway sources developed by U. S. EPA’s Office of Research and Development) using a field study conducted in downtown Los Angeles in 2008. The evaluation supports the proposed replacement when AERMOD is executed with onsite meteorological data.
AERMOD and AUSPLUME: Understanding the Similarities and Differences BREEZE Software
In this presentation, similarities and differences between AERMOD and AUSLPUME are discussed and analysed with the ultimate goal of easing the transition from AUSPLUME to AERMOD in Victoria, as well as Australia as a whole. Topics discussed include source types, treatment of terrain, plume rise algorithms, low wind speed conditions, and chemical transformations.
Technical Considerations of Adopting AERMOD into Australia and New Zealand BREEZE Software
To ease the adoption of AERMOD into Australia and New Zealand, several technical aspects that are important to the use of AERMOD are discussed in this presentation. These technical aspects include mixing height calculation techniques, surface parameter sensitivities and considerations, urban option applicability, and selection of terrain.
Hazardous location protection methods e book by pepperl+ fuchsKristen_Barbour_PF
Hazardous Location Protection Methods Explained.
By definition, a hazardous (classified) location is an area in an industrial complex where the atmosphere contains flammable concentrations of gases or vapors by leakage, or ignitable concentrations of dust or fibers by suspension or dispersion.
The treatment of dangerous substances, where the risk of explosion or fire exists that can be caused by an electrical spark, arc, or hot temperatures, requires specifically defined instrumentation located in a hazardous location. It also requires that interfacing signals coming from a hazardous location be unable to create the necessary conditions to ignite and propagate an explosion.
CFD Modelling for Process Design and Optimisation, by Graeme LaneGraeme Lane
This presentation provides a brief overview of some of my modelling studies over recent years, covering a range of industrial applications including mixing, settling, multiphase flow, and particle erosion.
Explosion Damage and Injury Assessment Modeling: Balancing Model Sophisticati...BREEZE Software
This paper will present the technological foundations of the BREEZE Explosion Damage Assessment Model (ExDAM) which seeks to fill the "sophistication gap" between purely distance-based simple models and CFD tools.
Validation of Airblast Damage Predictions Using A Microcomputer Based High Ex...BREEZE Software
This paper presents additional data which verifies the capability of HEXDAM to accurately predict structural damage for wide range structure types and explosive events.
Explosion Modeling and Damage Assessment Software BREEZE Software
This article will briefly discuss the potential for industrial explosions, outline the steps in using HEXDAM and VEXDAM to predict the effects of the explosion, and explain how to use this information to ensure workers' safety and minimize facility damage resulting from explosions.
Fracture mechanics based estimation of fatigue life of weldsAvinash B
This paper presents a mechanism based approach for lifetime prediction of welded joints, subjected to a multiaxial nonproportional
loading. Assuming the existence of crack-like flaws after the welding process, the stage of a fatigue crack
initiation becomes insignificant and the threshold for the initial crack propagation can be taken as a criterion for very
high cycle fatigue (VHCF) whereas crack growth analysis can be used for low and high cycle fatigue (LCF, HCF). The
proposed deterministic method, which is based on the welding process simulation, thermophysical material modeling
and fracture mechanics, considers the most important aspects for fatigue of welds. Applying worst case assumptions,
fatigue limits derived by this method can be then used for the fatigue assessment of complex welded structures. The
capability of the approach is validated by S-N curves provided at the Recommendations of the IIW.
Modifying Hamming code and using the replication method to protect memory aga...TELKOMNIKA JOURNAL
As technology scaling increases computer memory’s bit-cell density and reduces the voltage of semiconductors, the number of soft errors due to radiation induced single event upsets (SEU) and multi-bit upsets (MBU) also increases. To address this, error-correcting codes (ECC) can be used to detect and correct soft errors, while x-modular-redundancy improves fault tolerance. This paper presents a technique that provides high error-correction performance, high speed, and low complexity. The proposed technique ensures that only correct values get passed to the system output or are processed in spite of the presence of up to three-bit errors. The Hamming code is modified in order to provide a high probability of MBU detection. In addition, the paper describes the new technique and associated analysis scheme for its implementation. The new technique has been simulated, evaluated, and compared to error correction codes with similar decoding complexity to better understand the overheads required, the gained capabilities to protect data against three-bit errors, and to reduce the misdetection probability and false-detection probability of four-bit errors.
Fragility analysis for the Performance-Based Design of cladding wall panels s...StroNGER2012
This paper presents a probabilistic method to support the design of cladding wall systems subjected to blast loads. The proposed method is based on the broadly adopted fragility analysis method (conditional approach), widely used in Performance-Based Design procedures for structures subjected to natural hazards like earthquake and wind. The cladding wall system under investigation is composed by non-load bearing precast concrete wall panels. From the blast design point of view, these wall panels must protect people and equipment from external detonations. The aim of this research is to compute both the fragility curves and the limit states exceedance probability of a typical precast concrete cladding wall panel considering the detonations of vehicle borne improvised explosive devices. Moreover, the limit states exceedance probability of the cladding wall panel is estimated by Monte Carlo simulation (unconditional approach) in order to validate the proposed fragility curves.
Structural Integrity Evaluation of Offshore Wind TurbinesFranco Bontempi
Wind turbines are complex structures that should deal with adverse weather
conditions, are exposed to impacts or ship collisions and, due to the strategic roles in
the energetic supplying, can be the goal of military or malevolent attacks.
Even if a structure cannot be design to resist any unforeseeable critical event
or arbitrarily high accidental action, this kind of systems should be able to maintain
integrity and a certain level of functionality also under accidental circumstances,
which are not contemplated or cannot be considered in the usual design verification.
According to a performance-based design view, the entity of actions to be resisted
and the services levels to be maintained are the design objectives, which should be
defined by the stakeholders and by the designer in respect of the regulation in force.
For what said above, the structural integrity of wind turbines is a central issue
in the framework of a safe design: it depends on different factors, like exposure,
vulnerability and robustness. Particularly, the requirement of structural vulnerability
and robustness are discussed in this paper and a numerical application is presented,
in order to evaluate the effects of a ship collision on the structural system of an
offshore wind turbine.
The investigation resorts nonlinear dynamic analyses performed on the finite
element model of the turbine and considers three different scenarios for the ship
collision. The review of the investigation results allows for an evaluation of the
turbine structural integrity after the impact and permits to identify some
characteristics of the system, which are intrinsic to the chosen organization of the
elements within the structure.
The various types of Impact , Crash Tests, Shock loading and the associated standards required to evaluate the various structures or vehicles for impact, shock and/or crashworthiness are discussed here.
Damage tolerance evaluation of wing in presence of large landing gear cutout ...eSAT Journals
Abstract Aircraft is symbol of a high performance mechanical structure, which has the ability to fly with a very high structural safety record. Aircraft experiences variable loading in service. Rarely an aircraft will fail due to a static overload during its service life. For the continued airworthiness of an aircraft during its entire economic service life, fatigue and damage tolerance design, analysis, testing and service experience correlation play a pivotal role. The present study includes the stress analysis and damage tolerance evaluation of the wing through a stiffened panel of the bottom skin with a landing gear cutout. Wing bottom skin experiences tensile stress field during flight. Cutouts required for fuel access and landing gear opening and retraction in the bottom skin will introduce stress concentration. Fatigue cracks will initiate from high tensile stress locations. An integral stiffened panel consisting a landing gear cutout is considered for the analysis. Stress analysis will identify the maximum tensile stress location in the panel. In a metallic structure fatigue manifests itself in the form of a crack which propagates. If the crack in a critical location goes unnoticed it could lead to a catastrophic failure of the airframe. A critical condition will occur when the stress intensity factor (SIF) at the crack tip becomes equal to fracture toughness of the material. SIF calculations will be carried out for a crack with incremental crack lengths using MVCCI method. Analytical evaluation of the crack arrest capability of the stiffening members ahead of the crack tip will be carried out. Index Terms: Key Aircraft, Design, wing, landing gear cutout, stress analysis, FEM, damage tolerance, integral stiffened panel.
Damage tolerance evaluation of wing in presence of large landing gear cutout ...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Hazardous location protection methods e book by pepperl+ fuchsKristen_Barbour_PF
Hazardous Location Protection Methods Explained.
By definition, a hazardous (classified) location is an area in an industrial complex where the atmosphere contains flammable concentrations of gases or vapors by leakage, or ignitable concentrations of dust or fibers by suspension or dispersion.
The treatment of dangerous substances, where the risk of explosion or fire exists that can be caused by an electrical spark, arc, or hot temperatures, requires specifically defined instrumentation located in a hazardous location. It also requires that interfacing signals coming from a hazardous location be unable to create the necessary conditions to ignite and propagate an explosion.
CFD Modelling for Process Design and Optimisation, by Graeme LaneGraeme Lane
This presentation provides a brief overview of some of my modelling studies over recent years, covering a range of industrial applications including mixing, settling, multiphase flow, and particle erosion.
Explosion Damage and Injury Assessment Modeling: Balancing Model Sophisticati...BREEZE Software
This paper will present the technological foundations of the BREEZE Explosion Damage Assessment Model (ExDAM) which seeks to fill the "sophistication gap" between purely distance-based simple models and CFD tools.
Validation of Airblast Damage Predictions Using A Microcomputer Based High Ex...BREEZE Software
This paper presents additional data which verifies the capability of HEXDAM to accurately predict structural damage for wide range structure types and explosive events.
Explosion Modeling and Damage Assessment Software BREEZE Software
This article will briefly discuss the potential for industrial explosions, outline the steps in using HEXDAM and VEXDAM to predict the effects of the explosion, and explain how to use this information to ensure workers' safety and minimize facility damage resulting from explosions.
Fracture mechanics based estimation of fatigue life of weldsAvinash B
This paper presents a mechanism based approach for lifetime prediction of welded joints, subjected to a multiaxial nonproportional
loading. Assuming the existence of crack-like flaws after the welding process, the stage of a fatigue crack
initiation becomes insignificant and the threshold for the initial crack propagation can be taken as a criterion for very
high cycle fatigue (VHCF) whereas crack growth analysis can be used for low and high cycle fatigue (LCF, HCF). The
proposed deterministic method, which is based on the welding process simulation, thermophysical material modeling
and fracture mechanics, considers the most important aspects for fatigue of welds. Applying worst case assumptions,
fatigue limits derived by this method can be then used for the fatigue assessment of complex welded structures. The
capability of the approach is validated by S-N curves provided at the Recommendations of the IIW.
Modifying Hamming code and using the replication method to protect memory aga...TELKOMNIKA JOURNAL
As technology scaling increases computer memory’s bit-cell density and reduces the voltage of semiconductors, the number of soft errors due to radiation induced single event upsets (SEU) and multi-bit upsets (MBU) also increases. To address this, error-correcting codes (ECC) can be used to detect and correct soft errors, while x-modular-redundancy improves fault tolerance. This paper presents a technique that provides high error-correction performance, high speed, and low complexity. The proposed technique ensures that only correct values get passed to the system output or are processed in spite of the presence of up to three-bit errors. The Hamming code is modified in order to provide a high probability of MBU detection. In addition, the paper describes the new technique and associated analysis scheme for its implementation. The new technique has been simulated, evaluated, and compared to error correction codes with similar decoding complexity to better understand the overheads required, the gained capabilities to protect data against three-bit errors, and to reduce the misdetection probability and false-detection probability of four-bit errors.
Fragility analysis for the Performance-Based Design of cladding wall panels s...StroNGER2012
This paper presents a probabilistic method to support the design of cladding wall systems subjected to blast loads. The proposed method is based on the broadly adopted fragility analysis method (conditional approach), widely used in Performance-Based Design procedures for structures subjected to natural hazards like earthquake and wind. The cladding wall system under investigation is composed by non-load bearing precast concrete wall panels. From the blast design point of view, these wall panels must protect people and equipment from external detonations. The aim of this research is to compute both the fragility curves and the limit states exceedance probability of a typical precast concrete cladding wall panel considering the detonations of vehicle borne improvised explosive devices. Moreover, the limit states exceedance probability of the cladding wall panel is estimated by Monte Carlo simulation (unconditional approach) in order to validate the proposed fragility curves.
Structural Integrity Evaluation of Offshore Wind TurbinesFranco Bontempi
Wind turbines are complex structures that should deal with adverse weather
conditions, are exposed to impacts or ship collisions and, due to the strategic roles in
the energetic supplying, can be the goal of military or malevolent attacks.
Even if a structure cannot be design to resist any unforeseeable critical event
or arbitrarily high accidental action, this kind of systems should be able to maintain
integrity and a certain level of functionality also under accidental circumstances,
which are not contemplated or cannot be considered in the usual design verification.
According to a performance-based design view, the entity of actions to be resisted
and the services levels to be maintained are the design objectives, which should be
defined by the stakeholders and by the designer in respect of the regulation in force.
For what said above, the structural integrity of wind turbines is a central issue
in the framework of a safe design: it depends on different factors, like exposure,
vulnerability and robustness. Particularly, the requirement of structural vulnerability
and robustness are discussed in this paper and a numerical application is presented,
in order to evaluate the effects of a ship collision on the structural system of an
offshore wind turbine.
The investigation resorts nonlinear dynamic analyses performed on the finite
element model of the turbine and considers three different scenarios for the ship
collision. The review of the investigation results allows for an evaluation of the
turbine structural integrity after the impact and permits to identify some
characteristics of the system, which are intrinsic to the chosen organization of the
elements within the structure.
The various types of Impact , Crash Tests, Shock loading and the associated standards required to evaluate the various structures or vehicles for impact, shock and/or crashworthiness are discussed here.
Damage tolerance evaluation of wing in presence of large landing gear cutout ...eSAT Journals
Abstract Aircraft is symbol of a high performance mechanical structure, which has the ability to fly with a very high structural safety record. Aircraft experiences variable loading in service. Rarely an aircraft will fail due to a static overload during its service life. For the continued airworthiness of an aircraft during its entire economic service life, fatigue and damage tolerance design, analysis, testing and service experience correlation play a pivotal role. The present study includes the stress analysis and damage tolerance evaluation of the wing through a stiffened panel of the bottom skin with a landing gear cutout. Wing bottom skin experiences tensile stress field during flight. Cutouts required for fuel access and landing gear opening and retraction in the bottom skin will introduce stress concentration. Fatigue cracks will initiate from high tensile stress locations. An integral stiffened panel consisting a landing gear cutout is considered for the analysis. Stress analysis will identify the maximum tensile stress location in the panel. In a metallic structure fatigue manifests itself in the form of a crack which propagates. If the crack in a critical location goes unnoticed it could lead to a catastrophic failure of the airframe. A critical condition will occur when the stress intensity factor (SIF) at the crack tip becomes equal to fracture toughness of the material. SIF calculations will be carried out for a crack with incremental crack lengths using MVCCI method. Analytical evaluation of the crack arrest capability of the stiffening members ahead of the crack tip will be carried out. Index Terms: Key Aircraft, Design, wing, landing gear cutout, stress analysis, FEM, damage tolerance, integral stiffened panel.
Damage tolerance evaluation of wing in presence of large landing gear cutout ...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Earthquake as a contemporary issue in structural engineering.docxjacksnathalie
Earthquake as a contemporary issue in structural engineering
Name:
Instructor Name:
Institution:
Course:
Date:
Earthquake as a contemporary issue in structural engineeringIntroduction
New technologies, designs, and innovations have led to construction of more magnificent, sophisticated, and mega structures civil structures around the world. However, the major challenge that remains unresolved is the response of the structures to unprecedented natural calamities such as earthquakes, winds, tsunamis, and landslides. Recent experiences and effects of the calamities, especially earthquakes have proven that more precaution must be taken to mitigate, or reduce their effects on civil structures.
In trying to address challenges caused by earthquakes on structural buildings, engineers and researchers have developed new innovations and technologies to enhance their safety to earthquakes. Many governments have taking new measures in the structural industry to in ensure new civil construction are safer and can withstand natural calamities. One major focus in the research is the development of structural control and measures to reduce the seismic responses of civil structures.Causes of Earthquake
Earthquakes result from compressional or tensional stresses that built up due to the movement of lithospheric plates of the earth's surface. Sudden release of stress or strain along a fracture in the earth's crust, results in motion of the opposing blocks of rock past one another. The vibrations caused by these movements produce energy that is propagated as waves through and around the earth. The seismic waves reach the earth surface impacts on civil structures.
In other cases, volcanic eruptions, landslides, rock-falls or explosions can also cause a quake, but of a lesser magnitude. Seismic waves emitted by powerful earthquake can trigger smaller quakes in a distant of hundreds of miles away
If the design and strength of the structure cannot contain the amount of energy in wave, they can collapse leading to damage and loss of lives.Magnitude of earthquake
The magnitude of earthquakes often determined by taking measurement of the amplitude of the seismic waves received on a seismograph. This is put into calculations to obtain the amount of energy released by the earthquake. For a unit increment in magnitude, there is nearly a thirty-fold increment in the energy associated. The effects of an earthquake on civil structures
There are several effects of earthquake, the effects of the earthquake felt more in a broad area surrounding the epicenter of the earthquake. In most cases, the surface of the earth just above the epicenter cracks due the underlying faults. The magnitude of the vibration and subsequent damage on civil structures in a region is partly dependent on ground features. Earthquake vibrations will last longer with greater magnitude in unconsolidated surface, like a poorly compacted fill. Bedrock areas are less affected. Worst damage occu ...
FATIGUE ASSESSMENT OF DATA ACQUISITION SYSTEM UNDER RANDOM VIBRATION LOAD FOR...IAEME Publication
This paper targets the reliability of Data Acquisition System through Fatigue
assessment under Random Vibration conditions. The fixed wing aircraft generate the
random vibrations during the entire sortie and are imposed on the avionics systems
installed on the platform. The limits defined as per MIL-STD-810D are superimposed
for assessment of Fatigue. Fatigue assessment of Data Acquisition System procedure
is presented and each step of the procedure is explained. A finite element model of the
system is built in ANSYS software Version R15.0 after generating a 3D CAD model in
SOLIDEDGE Software Version ST 7.0. The model is evaluated for stresses generated
on imposing Random Vibration loading for One Hour each in X, Y and Z axes. The
natural frequencies in all three axes were determined. The fatigue life assessment has
been done for Cumulative damage using Miner’s damage rule. The study of fatigue
assessment results in that Data Acquisition System has residual life and it can sustain
random vibration loading of further 15.18 hrs
Similar to Large scale vc explosion consequence modeling final manuscript (20)
How Recreation Management Software Can Streamline Your Operations.pptxwottaspaceseo
Recreation management software streamlines operations by automating key tasks such as scheduling, registration, and payment processing, reducing manual workload and errors. It provides centralized management of facilities, classes, and events, ensuring efficient resource allocation and facility usage. The software offers user-friendly online portals for easy access to bookings and program information, enhancing customer experience. Real-time reporting and data analytics deliver insights into attendance and preferences, aiding in strategic decision-making. Additionally, effective communication tools keep participants and staff informed with timely updates. Overall, recreation management software enhances efficiency, improves service delivery, and boosts customer satisfaction.
In software engineering, the right architecture is essential for robust, scalable platforms. Wix has undergone a pivotal shift from event sourcing to a CRUD-based model for its microservices. This talk will chart the course of this pivotal journey.
Event sourcing, which records state changes as immutable events, provided robust auditing and "time travel" debugging for Wix Stores' microservices. Despite its benefits, the complexity it introduced in state management slowed development. Wix responded by adopting a simpler, unified CRUD model. This talk will explore the challenges of event sourcing and the advantages of Wix's new "CRUD on steroids" approach, which streamlines API integration and domain event management while preserving data integrity and system resilience.
Participants will gain valuable insights into Wix's strategies for ensuring atomicity in database updates and event production, as well as caching, materialization, and performance optimization techniques within a distributed system.
Join us to discover how Wix has mastered the art of balancing simplicity and extensibility, and learn how the re-adoption of the modest CRUD has turbocharged their development velocity, resilience, and scalability in a high-growth environment.
Experience our free, in-depth three-part Tendenci Platform Corporate Membership Management workshop series! In Session 1 on May 14th, 2024, we began with an Introduction and Setup, mastering the configuration of your Corporate Membership Module settings to establish membership types, applications, and more. Then, on May 16th, 2024, in Session 2, we focused on binding individual members to a Corporate Membership and Corporate Reps, teaching you how to add individual members and assign Corporate Representatives to manage dues, renewals, and associated members. Finally, on May 28th, 2024, in Session 3, we covered questions and concerns, addressing any queries or issues you may have.
For more Tendenci AMS events, check out www.tendenci.com/events
Paketo Buildpacks : la meilleure façon de construire des images OCI? DevopsDa...Anthony Dahanne
Les Buildpacks existent depuis plus de 10 ans ! D’abord, ils étaient utilisés pour détecter et construire une application avant de la déployer sur certains PaaS. Ensuite, nous avons pu créer des images Docker (OCI) avec leur dernière génération, les Cloud Native Buildpacks (CNCF en incubation). Sont-ils une bonne alternative au Dockerfile ? Que sont les buildpacks Paketo ? Quelles communautés les soutiennent et comment ?
Venez le découvrir lors de cette session ignite
Innovating Inference - Remote Triggering of Large Language Models on HPC Clus...Globus
Large Language Models (LLMs) are currently the center of attention in the tech world, particularly for their potential to advance research. In this presentation, we'll explore a straightforward and effective method for quickly initiating inference runs on supercomputers using the vLLM tool with Globus Compute, specifically on the Polaris system at ALCF. We'll begin by briefly discussing the popularity and applications of LLMs in various fields. Following this, we will introduce the vLLM tool, and explain how it integrates with Globus Compute to efficiently manage LLM operations on Polaris. Attendees will learn the practical aspects of setting up and remotely triggering LLMs from local machines, focusing on ease of use and efficiency. This talk is ideal for researchers and practitioners looking to leverage the power of LLMs in their work, offering a clear guide to harnessing supercomputing resources for quick and effective LLM inference.
Into the Box Keynote Day 2: Unveiling amazing updates and announcements for modern CFML developers! Get ready for exciting releases and updates on Ortus tools and products. Stay tuned for cutting-edge innovations designed to boost your productivity.
Modern design is crucial in today's digital environment, and this is especially true for SharePoint intranets. The design of these digital hubs is critical to user engagement and productivity enhancement. They are the cornerstone of internal collaboration and interaction within enterprises.
Prosigns: Transforming Business with Tailored Technology SolutionsProsigns
Unlocking Business Potential: Tailored Technology Solutions by Prosigns
Discover how Prosigns, a leading technology solutions provider, partners with businesses to drive innovation and success. Our presentation showcases our comprehensive range of services, including custom software development, web and mobile app development, AI & ML solutions, blockchain integration, DevOps services, and Microsoft Dynamics 365 support.
Custom Software Development: Prosigns specializes in creating bespoke software solutions that cater to your unique business needs. Our team of experts works closely with you to understand your requirements and deliver tailor-made software that enhances efficiency and drives growth.
Web and Mobile App Development: From responsive websites to intuitive mobile applications, Prosigns develops cutting-edge solutions that engage users and deliver seamless experiences across devices.
AI & ML Solutions: Harnessing the power of Artificial Intelligence and Machine Learning, Prosigns provides smart solutions that automate processes, provide valuable insights, and drive informed decision-making.
Blockchain Integration: Prosigns offers comprehensive blockchain solutions, including development, integration, and consulting services, enabling businesses to leverage blockchain technology for enhanced security, transparency, and efficiency.
DevOps Services: Prosigns' DevOps services streamline development and operations processes, ensuring faster and more reliable software delivery through automation and continuous integration.
Microsoft Dynamics 365 Support: Prosigns provides comprehensive support and maintenance services for Microsoft Dynamics 365, ensuring your system is always up-to-date, secure, and running smoothly.
Learn how our collaborative approach and dedication to excellence help businesses achieve their goals and stay ahead in today's digital landscape. From concept to deployment, Prosigns is your trusted partner for transforming ideas into reality and unlocking the full potential of your business.
Join us on a journey of innovation and growth. Let's partner for success with Prosigns.
Enhancing Research Orchestration Capabilities at ORNL.pdfGlobus
Cross-facility research orchestration comes with ever-changing constraints regarding the availability and suitability of various compute and data resources. In short, a flexible data and processing fabric is needed to enable the dynamic redirection of data and compute tasks throughout the lifecycle of an experiment. In this talk, we illustrate how we easily leveraged Globus services to instrument the ACE research testbed at the Oak Ridge Leadership Computing Facility with flexible data and task orchestration capabilities.
OpenFOAM solver for Helmholtz equation, helmholtzFoam / helmholtzBubbleFoamtakuyayamamoto1800
In this slide, we show the simulation example and the way to compile this solver.
In this solver, the Helmholtz equation can be solved by helmholtzFoam. Also, the Helmholtz equation with uniformly dispersed bubbles can be simulated by helmholtzBubbleFoam.
First Steps with Globus Compute Multi-User EndpointsGlobus
In this presentation we will share our experiences around getting started with the Globus Compute multi-user endpoint. Working with the Pharmacology group at the University of Auckland, we have previously written an application using Globus Compute that can offload computationally expensive steps in the researcher's workflows, which they wish to manage from their familiar Windows environments, onto the NeSI (New Zealand eScience Infrastructure) cluster. Some of the challenges we have encountered were that each researcher had to set up and manage their own single-user globus compute endpoint and that the workloads had varying resource requirements (CPUs, memory and wall time) between different runs. We hope that the multi-user endpoint will help to address these challenges and share an update on our progress here.
Field Employee Tracking System| MiTrack App| Best Employee Tracking Solution|...informapgpstrackings
Keep tabs on your field staff effortlessly with Informap Technology Centre LLC. Real-time tracking, task assignment, and smart features for efficient management. Request a live demo today!
For more details, visit us : https://informapuae.com/field-staff-tracking/
In 2015, I used to write extensions for Joomla, WordPress, phpBB3, etc and I ...Juraj Vysvader
In 2015, I used to write extensions for Joomla, WordPress, phpBB3, etc and I didn't get rich from it but it did have 63K downloads (powered possible tens of thousands of websites).
Advanced Flow Concepts Every Developer Should KnowPeter Caitens
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Large scale vc explosion consequence modeling final manuscript
1. Large-Scale VCE Consequence Modeling for Industrial Facility
Siting, Risk Assessment, Hazard Mitigation Design, and Response
Planning
Qiguo Jing, Ph.D., Brian Holland*, Tiffany Gardner#
, Yumna Moazzam, and
Weiping Dai, Ph.D., CM, P.E.
Trinity Consultants Inc.
Dallas, TX 75251, USA
(972) 661-8100
*
Presenter, E-mail: bholland@trinityconsultants.com
#
Communication Author, E-mail: tgardner@trinityconsultants.com
Abstract
New, fully three dimensional, technologies are now making it possible to more quickly and
accurately simulate and predict the consequences of accidental releases leading to vapor cloud
explosions (VCE) at a wide variety of industrial facilities. The primary objective of these
explosion consequence analysis (ECA) technologies is to assess building damage and occupant
injury levels for both ‘individual’ and ‘all possible’ release and explosion scenarios. A typical
industrial facility can have hundreds of potential release scenarios and hundreds of potential
VCE locations leading to an exponential number of possible explosion scenarios.
High speed 3D modeling techniques can provide updateable, on-going and real-time capabilities
for analyzing individual and all possible release and explosion scenarios. These ECA
technologies, combined with release probabilities, make possible quantitative risk assessments
(QRA) which lead to better risk evaluations, mitigation strategies, risk management, and
emergency response planning.
In this paper, the Vapor Cloud Explosion Damage Assessment module in BREEZE ExDAM is
used to demonstrate a high speed 3D modeling technique that can quickly 1) generate 3D
models of large-scale chemical/petroleum facilities with hundreds of building structures,
hundreds of release locations, and hundreds of congestion zones, 2) simulate, display, and
document the consequences of individual release scenarios involving a subset of congestion
zones within a single plume geometry, and 3) compute, display, and document the maximum
consequence levels resulting from explosions at all identified congestion zones.
Introduction
Failure to identify and mitigate explosion hazards is a persistent cause of industrial accidents,
impacting sites ranging from fertilizer storage facilities [1] to refineries. While some ECA are
2. performed to comply with regulatory requirements or industry-specific process safety standards
[2] [3] [4], in many cases the potential for loss of life and property damage is overlooked until a
tragedy occurs. Explosion Consequence Modeling (ECM) can provide detailed information
about the possible effects of a blast, and can be used to identify and design mitigation measures.
The two traditional ECM techniques have been: 1) basic phenomenological models that are very
cost-effective but provide very simplistic results, and 2) computational fluid dynamics (CFD)
techniques which provide great detail but are time consuming and can be prohibitively
expensive. Many facilities are in need of a detailed ECM analysis to identify and mitigate
explosion hazards, but require a moderate approach that can provide detailed damage and injury
predictions without the high costs of CFD modeling.
The Explosive Damage Assessment Model (ExDAM), originally developed by Dr. Frank Tatom
and marketed as part of Trinity Consultants’ BREEZE® Software, expands on the basic
phenomenological model concept by adding the ability to model damage and injury while
accounting for the structural details of buildings as well as the shielding effect of structures and
equipment on the area behind them. Thus, ExDAM provides the safety benefits of a detailed
ECM study to a much wider range of facilities at risk from either conventional high explosive
(HE) materials or VCE [5].
In this paper we will describe ExDAM’s VCE model, VExDAM, discuss the characteristics and
capabilities of the model and demonstrate a fast and efficient demonstration simulation of a
large-scale VCE in an industrial facility.
ExDAM Explosion Models
ExDAM provides a phenomenological method to predict damage and injury levels for open-air
explosions. Historically, since the mid-1980s, organizations involved in the development of this
method include the Strategic Defense Command, U.S. Army Corps of Engineers, Southwest
Research Institute, Facility Army System Safety (FASS) Office, the Naval Civil Engineering
Laboratory, Engineering Analysis, Inc. (EAI), and BREEZE Software / Trinity Consultants, Inc.
The predecessors to HExDAM, the Nuclear Damage Assessment Model (NDAM) and the
Enhanced Nuclear Damage Assessment Model (ENDAM), were originally developed to predict
large-scale structure damage for nuclear blasts using the Physical Vulnerability System (PVS)
[6]. The mathematical and computational aspects of this system are provided in a companion
public/unclassified document [7]. ENDAM evolved into HExDAM when the blast pressure
profiles and structure vulnerability data were modified to accommodate conventional high
explosives. The overpressure and impulse fields in HExDAM are computed according to
Glasstone [8].
To accommodate the need for modeling VCEs, VExDAM was developed. VExDAM uses Van
den Berg’s Multi-Energy Method [9] to generate 3D overpressure and impulse profiles for
spherical vapor clouds. Multiple spherical vapor clouds are used to model more complex vapor
cloud geometries, and the effects of these sub-clouds are combined to produce cumulative
3. overpressure/impulse fields. Once the initial overpressure and impulse fields are calculated, both
HExDAM and VExDAM use the same methodology to compute shielding effects and
injury/damage.
The shielding algorithm in ExDAM uses the actual design of buildings to provide more detailed
results. For example, a blast wave may destroy window glass and wood-frame walls in the
model, allowing persons standing behind the window or wood-frame wall to receive the full
effect of the blast, but leave a concrete wall intact, shielding people behind that wall. ExDAM
models these effects, which allows evaluation of existing structures as well as possible mitigation
measures such as blast hardening of structures and addition of protective berms or walls.
Damage effects are calculated based on the material type (e.g. glass versus wood-frame
construction versus cinder block construction). Injuries are determined based on the ExDAM
human body model, which is composed of 28 total body components and 19 different body
component types (e.g. various bones, organs, etc.). The model accounts for the fact that different
materials/body parts are sensitive to different aspects of a blast wave. For example, ear drums
are sensitive to the peak overpressure value, while long bone injuries are caused more by
dynamic pressure. Damage levels are typically reported in four categorized: no damage, slight
damage (useable, requiring minor repairs), moderate damage (partially usable or temporarily
unusable, requiring major repairs), and severe damage (permanently unusable, irreparable).
Injury levels are typically reported in six categories: no injury, walking wounded, needs minor
surgery, seriously injured requiring major surgery, unlikely to reach hospital alive, and deceased.
ExDAM presents damage/injury levels in a straightforward color-coded visual format with
associated numerical data in tables.
Automated Sub-Cloud Creation in ExDAM
In contrast to conventional methods, in which an explosion VCE is regarded as a single entity, in
the Multi-Energy concept a VCE is rather defined as a number of sub-explosions corresponding
to the various partially confined/obstructed areas in the cloud [10]. In this Multi-Energy concept,
a turbulence generating environment is required for the development of an explosion from a
premixed combustion. If the boundary conditions of the expanding flow field induced by a
premixed combustion are such that turbulence is generated, and the flame, which is transported
by convection in the flow field, will interact with the turbulence: the turbulence increases the
flame front area (the interface between reactants and combustion products) by which the
combustion process intensifies and more reactants are converted into combustion products. The
stronger expansion results in a higher velocity and enhances turbulence, which triggers a positive
feed-back coupling between turbulence and combustion.
The Multi-Energy concept states that a blast is generated in a VCE only in the parts of the vapor
cloud which are congested and/or partially confined, and it is very difficult to detonate an
unconfined vapor cloud from an accidental release of hydrocarbons in an open area. As such, for
a flammable gas cloud, significant overpressure can only be generated in those parts of the cloud
which have a substantial degree of partial confinement and/or are congested due to the presence
of obstacles.
4. This congestion/confinement foundation of Multi-energy concept provides researchers [11] [12]
a way to qualitatively estimate the initial explosion strength on a scale ranging from 1 to 10.
ExDAM uses this concept to quickly and effectively build sub-clouds around pre-defined
congestion zones: the size of sub-clouds will be limited by the size of congestion zones. The
procedures are described below:
Define congestion zones and prepare the congestion zone dimensions based on the
configuration of the facility. See Figure 1;
Import the congestion zones into ExDAM. See Figure 2;
Select a source center for an accidental release, provide a dispersion radius, and ExDAM
automatically creates sub-clouds bounded by each congestion zone. See Figure 3.
Figure 1. A Typical Industrial Facility.
5. Figure 2. Congestion Zone Assignment in ExDAM.
Figure 3. Sub-Clouds Bounded by Congestion Zone in ExDAM Assuming Dispersion Covers
Entire Industrial Facility.
6. Experimental data indicate that gas explosions may develop overpressures which range from a
few millibars under unobstructed or unconfined conditions, up to more than 10 bars for severely
congested and confined conditions [13]. As such, when congested portions of the blast cloud are
present, the blast produced by the remainder of the cloud (unconfined areas) is assumed to be
“negligible”. Figure 3 indicates that instead of creating one large vapor cloud based on the
dispersion radius, ExDAM creates sub-clouds tailored to the size and location of the individual
congestion zones within the dispersion radius.
The Multi-Energy concept is based on the assumption that detonation in the uncongested parts of
a cloud can be ruled out. It is assumed that the uncongested fuel-air mixture is too non-
homogeneously mixed to maintain a detonation. This assumption seems to be realistic for a wide
range of conditions. Fuels of relatively high reactivity, however are more susceptible to
denotation. In particular, in applications with more highly-reactive fuels such as ethylene or
propylene, and/or situations where vapor cloud dispersion is suppressed and the fuel is mixed
well with air and develops sufficient homogeneity, it may be realistic to consider the possibility
of detonation in a substantial portion of the unconfined mixture. ExDAM takes this into
consideration, and allows the involvement of the flammable gas outside of congestion. Figure 4
shows the sub-clouds with 60% increase in radius comparing with the sub-clouds in Figure 3.
Figure 4. Sub-Clouds with Involvement of Flammable Gas Outside of Congestion Zone
7. Large-Scale VCE Consequence Modeling with BREEZE ExDAM: A
Demonstration
A demonstration of consequence modeling of a large-scale ethylene VCE with BREEZE
ExDAM is presented in this section. The development of this large-scale VCE consequence
modeling involves three steps:
Edit Building Structure.
Complex building/block structures can be quickly created within ExDAM’s 3D window
using an extensive set of basic block editing operations (e.g. cut, stretch, copy, rotate,
translate) and advanced shape editing functions (e.g. extrude/interpolate/extrapolate,
cylinder/sphere, building with walls/floor/ceiling/windows/people). Structure editing in
ExDAM is facilitated with options to import images and 2D/3D line/surface models (e.g.
DXF or DWG format). ExDAM is further equipped with a tool to import massive
building blocks from a text file with predefined coordinates and dimensions. Figure 5
shows the ExDAM UI for importing structures from text file and the populated building
blocks on a 2D base map in ExDAM 3D window.
Figure 5. Importing Structures from Text File
8. Create Vapor Clouds.
With the automated sub-cloud creation tool in ExDAM, hundreds of vapor clouds can be
quickly created with a few mouse clicks and keyboard operations and precisely located
around congestion zones. The size of each vapor cloud is determined by the size of
corresponding congestion zone and the degree of user-specified involvement of
flammable gas outside congestion zone, regardless of the actual quantity released during
an accident. The number of vapor clouds will be determined by the distribution of
congestion zones and the dispersion radius. Figure 6 shows the ExDAM UI for
importing congestion zone and populating ethylene vapor clouds with a 100 meter
dispersion radius of a release point.
Figure 6. Importing Congestion Zone from Text File and Automatic Creation of Vapor Clouds
Specify Sample Grid.
A pressure/impulse sample grid is specified with a fixed boundary and fixed resolution in
3D. Peak pressure/impulse value will be computed for each sample grid point.
9. Figure 7 shows 2D overpressure contour plans above ground. The upper panel shows
overpressure modeled without shielding effects; the lower panel is modeled with shielding
effects. The computed overpressure at each grid point is the sum of overpressure from all sub-
clouds at that point. Two critical levels of 0.6 psi and 0.9 psi are defined in API 753 for portable
light wood trailers. The endpoint distances to both critical levels are shortened when buildings
provide shielding behind.
Figure 7. Overpressure Contour Plans
10. Figure 8 shows color-coded resulting damage levels to the buildings closest to the blast center
and injury levels to the people closest to the blast. As before, the upper panel is modeled without
shielding effects; lower panel is modeled with shielding effects. For a better view, the people are
enlarged. Note how structures provide shielding to people inside and structure behind.
Figure 8. Color-Coded Damage/Injury
Summary
The BREEZE ExDAM model provides an intermediate complexity solution, comparing with
basic phenomenological models and complex CFD models. ExDAM is well-suited to modeling
explosions of vapor clouds in environments where large obstructed areas are presence and
shielding caused by structures and people may have an effect.
11. The congested/confined area principle in the Multi-Energy concept is adopted in ExDAM.
Hundreds of vapor clouds can be quickly and precisely developed around the congested
boundary defined within a dispersion radius during an industrial accident release, so that large-
scale ECM using ExDAM is made relatively simple to perform and understand in comparison to
CFD modeling. Flammable gas outside congestion zone are generally ruled out from ECM.
However, depending on the actual situation, an adjustment can be made using ExDAM, and
portions of the uncongested flammable gas cloud can be involved in the ECM.
References
1. S. Koch, Q. Jing, B. Holland, and W. Dai, “Large-Scale Explosion Consequence Modeling:
West, Texas Fertilizer Plant Case Study”, 2014 Mary Kay O'Connor Process Safety Center
International Symposium, College Station, TX, 2014.
2. API-RP-752, "Management of Hazards Associated with Location of Process Plant Permanent
Buildings", December 2009.
3. API-RP-753, "Management of Hazards Associated with Location of Process Plant Portable
Buildings", June 2007.
4. Office of The Under Secretary of Defense, "DOD Contractor's Safety Manual for
Ammunition and Explosives", DoD 4145.26-M, March 13, 2008.
5. B. Holland, S. Koch, Q. Jing, T. Gardner, and W. Dai, “Explosion Consequence Modeling:
Balancing Model Sophistication with Finite Resources,” 2014 Mary Kay O'Connor Process
Safety Center International Symposium, College Station, TX, 2014.
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Weapons," AP-55-1-2-69-INT (Confidential), June 1, 1969.
7. Defense Intelligence Agency, "Mathematical Background and Programming Aids for the
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8. S. Glasstone and P. J. Dolan, Eds., “The Effects of Nuclear Weapons”, Third Edition, U.S.
DOD and Energy Research and Development Administration, 1977.
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